The Speech Devices SDK does more than create a wake word. It does speech recognition, language understanding, and translation. If your kiosk is going to be put in a place with background noise that could interfere with the main subject of your voice recognition, then an array microphone will be your best option.
At the beginning of this recipe, we mentioned that the Speech Devices SDK also supports circular microphones. While array microphones are designed to point directly at the person talking, circular microphones are designed to be put perpendicular to the people talking. They can help determine the direction of the person speaking and are often used in a multi-speaker scenario, such as diarization.